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1、AmericanMineralogist,Volume96,pages1112–1119,2011EvidenceforboronincorporationintotheserpentinecrystalstructureSonjaPabSt,1,*thomaSZack,2IvanP.Savov,3thomaSLudwIg,1detLefRoSt,4,†andedwaRdP.vIcenZI4,‡1InstitutfürGeowissenschaften,Ruprecht-Karls-UniversitätHeidelberg,69120Heidelberg,
2、Germany2InstitutfürGeowissenschaften,Johannes-Gutenberg-UniversitätMainz,55099Mainz,Germany3SchoolofEarthandEnvironment,LeedsUniversity,LeedsLS29JT,U.K.4DepartmentofMineralSciences,SmithsonianInstitution,NationalMuseumofNaturalHistory,Washington,D.C.20560,U.S.A.abStRactSerpentinite
3、mudvolcanoesfromtheMarianaforearccompriseB-richmantlewedgeperidotitesserpentinizedbyslabfluids.Themajorcomponentoftheserocksareserpentinegroupminerals[Mg3Si2O5(OH)4],showinghighlyvariabletexturalandgeochemicalfeatures.Micro-Ramanspectros-copyrevealsthattheserpentinemineralsarewell-
4、crystallizedlizarditeandchrysotile.InsituSIMSspotanalysesandelementmappingviaToF-SIMSshowthatBisevenlydistributedacrossserpentinegrains,suggestingthatserpentine,bothlizarditeandchrysotileindifferenttexturalregions,canhostsignificantamountsofB(upto∼200µg/g)intoitscrystalstructure.As
5、suchstructurallyboundBcanonlybereleasedduringrecrystallizationorserpentinebreakdown,ourresultshaveimplicationsformodelingoftheefficiencyofcross-arcfluidmobileelementrecyclinginsubductionzonesandstresstheimportanceofthehydratedforearcmantleasareservoirforfluidmobileelements.Keywords
6、:Boron,lithium,serpentine,SIMS,ToF-SIMS,micro-Ramanspectroscopy,subduc-tion,MarianaforearcIntRoductIonthatwithinsupra-subductionzones,forearcserpentinitesareamajorsinkforvarioustraceelementssuchasB,Li,As,Sb,I,Boron(B)isahighlyfluidmobiletraceelementthatisveryandCs(e.g.,Fryeretal.19
7、90;Bentonetal.2001;Mottletal.incompatibleduringmagmaticprocesses.Asaresultofthis2003;Scambellurietal.2004;Savovetal.2005).Sinceprimaryincompatibility,BisstronglyenrichedintheEarth’ssurfacemineralsinmantleperidotites,suchasolivineandpyroxene,are(2–28µg/gBincontinentalcrust;Rudnickan
8、dGao2004)andvirtuallydevoi
